I would argue the writers were consistant with Dukat the entire series.
At the core, he is self-centered and wants the universe to acknowledge his greatness. Everything he did from being Prefect of the Occupation to switching government sides in "THE WAY OF THE WARRIOR" to his "I am the only Cardassian left!" speech to Kira and going on a crusade against the Klingons to his deal with the Dominion to the Pah-Wraith cult to his getting blinded to get the secrets of the book.
Everything was about his need to be adored and loved and acknowledged as great by everyone... even his enemies. His line to Weyoun about making your enemies see they were wrong to oppose you in the first place was probably the most telling piece of dialogue for his mode of thinking.
When he went nuts, it was because his self image was finally broken. Ziyal was probably the only Bajoran, despite being half, that truly loved him... and he had a deep need to feel the love of a Bajoran because he was doing them a 'favor' by being so 'kind'.
When she was killed, it shattered that love, and I think that's what ultimately broke him for that bit.
At the core, he is self-centered and wants the universe to acknowledge his greatness. Everything he did from being Prefect of the Occupation to switching government sides in "THE WAY OF THE WARRIOR" to his "I am the only Cardassian left!" speech to Kira and going on a crusade against the Klingons to his deal with the Dominion to the Pah-Wraith cult to his getting blinded to get the secrets of the book.
Everything was about his need to be adored and loved and acknowledged as great by everyone... even his enemies. His line to Weyoun about making your enemies see they were wrong to oppose you in the first place was probably the most telling piece of dialogue for his mode of thinking.
When he went nuts, it was because his self image was finally broken. Ziyal was probably the only Bajoran, despite being half, that truly loved him... and he had a deep need to feel the love of a Bajoran because he was doing them a 'favor' by being so 'kind'.
When she was killed, it shattered that love, and I think that's what ultimately broke him for that bit.